The invention discloses an automatic control precision pulsation welding device for inner hole part inner wall damage. The welding device comprises a workpiece and equipment. The equipment is composed of an automatic wire feeding machine, a lift bridge, a guiding polish rod, a front and back trimming structure, a left and right alignment structure, an automatic lift structure, a welding gun, an automatic feed structure, a rotary servo motor, a self-rotating structure and a wire harness support structure. The self-rotating structure comprises a support structure, a guiding structure, a big gear wheel, a big gear wheel fixed bracket, a rotating head and a small gear wheel. The automatic feed structure comprises a lead screw motor, a feed guide rod, a rotatable gun-clamping block, an automatic wire feeding machine opening, a wire feeding angle adjusting bracket, a feed motion limitation switch, a high-precision miniature linear guide and a feed screw. The automatic control precision pulsation welding device for inner hole part inner wall damage has the advantages that the sealing surface damage of the inner hole part which is difficult to be repaired for traditional surfacing can be effectively restored, none of the part after being restored is distorted, and the workpiece doses not deform in the welding process.